Improvement in adjustable gun-scrapers



' tice"v it.

UNITED STATES PATENT OFFICE.

E. L. PRATT, OF BOSTON MASSACHUSETTS.

iMPROV'EM ENT IAN ADJUSTABLE. GUN-SCRAPERS.

.Specification forming part of Letters Patent No. 46,140, dated January 3l, 1865.

.To all whom it may concern:

Be4 it known that I, E. L. TRATT, ci" Boston, in the county of Suiolk and State of Massachusetts, have linventenl an improved Gun- Scraper; and I do hereby declare that-'the fol-- lowing, taken in connection with the drawings which accompany and 'form part of this speci- 'iicatiom isadeseription of my invention sufcient to enable those skilled in the art to prac- Leaers Patent-0f the United states No.

'43,573 Werev granted Jul-y 19, 1864, on the in- 'vention of Moses G. Graue for a gun-scraper,

whichAv Letters Patent were assigned by said Crane to me, asl may be seen by reference to the Record of Transfers of United StatesPat.- ents, lib. 07, fol. 60. The invention embodied Viii-:such gun-scraper was the employment of a .'serie/s-l of scrapers'with edges corresponding in curvature to the bore of the arm no be cleaned, and so constructed and applied to or .united with a shank-piece to which the ramvrod was aiilxed that, While they Were held to- -eaeh scraper that lit swings or'turns loosely in a lplanepe'rpendicular to the axis of. the tool, and als'oiu so constructing or applying each scraper that it is removable from thetool. for "repair'or replacement.

- Aguri-scraper embodying myimprcveinents is shown in the drawings, Figure i. represent'- ing anelevation of `Iit with Vthe scrapers held together; Fig. 2, an elevation With the scrapers open, Fig. 3, an end viewwith the scrapers closed; lFig. 4, a similar'view with them open; AFlips-5, a cross-'section on line :o of Fig.

1, and Fig. 6 a central longitudinal section."

, c -represents the shank-piece, into which are *inserted and. fastened -a series oi' spring-Wires, b, 'eachiof which carries upon its lower enda plate, o, the outer edge of 'which is circular, and forms the scraping-edge, by the series of which the gun-barrel is cleaned. Each plate is screwed upon its rod or stem b, this being the mannerl prefer, though the plate may-be otherwise jointed to its stern, but so as'to be capable of turning or swiveling thereupon.

. The screw-thread in each plate and the thread upon its stem are so formed that the plate turns readily upon its stem, -each plate being kept from unscrewing by. coming in fcontact with the' next adjacent one; Normally the spring-stems hold the plates about in the position as to distance apartshown Yin Fig. 4., or perhaps a little farther apart than, that: but-,by bending either spring out byA force.

its scraper-plate can be rotated-on itsscrewthread Without striking the nextone, and by this. means may be easily removed for repair,

or to be substituted, When Worn, by another. An encompassing andeonining" ring, d, holds the plates together, aszseen in Figs. l'

and 3, the external diameter ofthis ring-being slightly less than the 'borel of theg'un to be cleaned. `Contact ofthe outer end ofthe ring with the breech ofv the gun forces the ifi-ngV from the plates, causing thein to spring out, as seen in Fig. 4,'the scraping-edgesbeing Ihereby pressed against the sides of the gunbarrel. New, in the gunlscraper before reerredtc, each scraping edge or plate is integral with the spring-'piece which connects it with the shank, and as it is not always possible to make each spring of uniform strength. and temper, the Whole .length of. each scrapingdge does not always press.v equally against the surface being scraped, and the consequence is that one corneroi' the scraper is frequently pressed against said surface, While the other falls back, thus causing said corner to injuriously scratch or cut into-the gun.

By making each scraper-plate separatefrcni Y the spring and so applying it that it can turn thereon or with reference thereto, as set forth, this difficulty is obviated, the Whole length of each' scraping-'edge pressing equally against the correspondiugly.-,curved surface being scraped, as will be readily'understood.

To guide the springs in theiroutward radial- "movement, the ring d is provided with projections e, inthe space between which the springs b liit andv move. 

